| Original Articles |
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Two-Colour Effect on the Ionization and Harmonic Generation of
One-Dimensional He+ |
| QU Wei-Xing1;GAN Ming-Long2;XIA Yu-Xing3;LI Ru-Xin1;XU Zhi-Zhan1 |
| 1Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics,
2Chinese Academy of Sciences, Shanghai 201800
Department of Computer Scinece and Technology, Shanghai Jiao Tong University, Shanghai 200030
3Department of Applied Physics, Shanghai Jiao Tong University, Shanghai 200030 |
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| Cite this article: |
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QU Wei-Xing, GAN Ming-Long, XIA Yu-Xing et al 2001 Chin. Phys. Lett. 18 1047-1049 |
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Abstract Using the one-demensional ion mode, We theoretically investigate the dynamics ionization process and the high-order harmonic generation of the He+ subject to different kinds of two-colour laser pulse with the same fundamental frequency but various harmonic frequencies. It is found that from the results calculated by numerically solving the time-dependent Schrödinger equation, the two-colour laser pulse with the fundamental frequency and harmonic frequency enables the power spectrum of high-order harmonic generation to increase by a few orders of magnitude and the yield of He+ to enhance significantly when the harmonic frequency of laser pulse is close to the energy interval between the ground state and the first excited state of He+; even the harmonic field added into the pulse is much weaker than the fundamental one.
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| Keywords:
33.80.Wz
42.50.Hz
42.65.Ky
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Published: 01 August 2001
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| PACS: |
33.80.Wz
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(Other multiphoton processes)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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